Title :
Optimal DC-link voltage balancing control for 3-level half-bridge series resonant DC-DC converter
Author :
Minkook Kim ; Seung-Hee Ryu ; Dong-Gyun Woo ; Byoung-Kuk Lee ; Jin Hur
Author_Institution :
Coll. of Inf. & Commun. Eng., Sungkyunkwan Univ., Suwon, South Korea
Abstract :
In this paper, optimal DC-link voltage balancing control for 3-level half-bridge series resonant DC-DC converter is proposed. The proposed converter can minimize switching frequency variation according to load and improve overall efficiency for a wide range of loads. However, the performance of proposed converter can be lowered by DC-link voltage unbalance. For figuring out voltage unbalance problem, three types of balancing strategies, PWM off, semi-HB, and direct conversion are proposed. The characteristics of these strategies are explained and compared in the aspect of balancing period, output voltage ripple, transient time, and efficiency. The validity of proposed converter is verified through simulation and experimental results.
Keywords :
DC-DC power convertors; PWM power convertors; bridge circuits; power system transients; resonant power convertors; voltage control; 3-level half-bridge series resonant DC-DC converter; PWM off strategy; balancing period; direct conversion strategy; optimal DC-link voltage balancing control; output voltage ripple; semiHB strategy; switching frequency variation minimization; transient time; Capacitance; Capacitors; Control systems; Pulse width modulation; Switching loss; Transient analysis; Voltage control; 3-Level converter; DC-link voltage balance; Half-bridge converter; Neutral Point Clamped Cell; Series resonant converter;
Conference_Titel :
Power Electronics and Motion Control Conference and Exposition (PEMC), 2014 16th International
Conference_Location :
Antalya
DOI :
10.1109/EPEPEMC.2014.6980550
